Assortment / System Description

Powers™ Controls Pneumatic Damper Actuators
Powers® Controls No. 3 Pneumatic Damper Actuators
The Powers® Controls No. 3 Pneumatic Damper Actuator is a compact, totally
enclosed, rolling diaphragm-type actuator designed for modulating or two-position
actuation of dampers or air valves. This actuator has a stroke length of 2-3/8 inches
(60mm) and is available in nominal spring ranges of 3 to 7 psi (21 to 50 kPa), 5 to 10 psi
(35 to 69 kPa) and 8 to 13 psi (55 to 90 kPa).
Part Numbers: 331-4310, 331-4311, 331-4312, 331-4313, 331-4314, 331-4331, 331-
4510, 331-4511, 331-4512, 331-4513, 331-4514, 331-4531, 331-4809, 331-4810, 331-
4811,
331-4812, 331-4813, 331-4814, 331-4831, 332-4811, 332-4831
Technical Instructions
Installation Instructions
Powers® Controls No. 4 Pneumatic Damper Actuators
The Powers™ Controls No. 4 Pneumatic Damper Actuator is a totally enclosed
pneumatic piston type actuator designed to operate dampers for ventilating systems,
mixing box control, and other applications requiring a large effective diaphragm area
and long stroke. This actuator has a stroke length of 4 inches (102mm) and is available
in nominal spring ranges of 3 to 7 psi (21 to 48 kPa), 3 to 13 psi (21 to 90 kPa), 5 to 10
psi (35 to 69 kPa) and 8 to 13 psi (55 to 90 kPa).
The POWERS™ No. 4 Damper Actuator "Hesitation" model is frequently used to
operate the outdoor air damper on unit ventilators. The hesitation feature enables the
outdoor air damper to be synchronized with the unit valve to maintain a predetermined
outdoor air requirement when the controlled zone is at the desired temperature.
Part Numbers: 331-2904, 331-2905, 331-2906, 331-2909, 331-2910, 331-2911, 331-
2917, 331-2927, 331-2929, 331-2930, 331-2931, 331-2934, 331-2961, 331-2963, 331-
2966,
331-2968, 331-2973, 331-2974, 331-3000, 331-3001, 331-3002, 331-3004, 331-3017,
331-3018, 332-2961, 332-2968, 332-2973, 332-3017
Technical Instructions
Installation Instructions
Powers® Controls No. 6 Pneumatic Damper Actuators
Powers® Controls No. 6 Pneumatic Damper Actuator is a heavy-duty, rolling diaphragm,
spring return actuator designed to drive large dampers, centrifugal refrigeration inlet
vanes, and other applications requiring a large, effective diaphragm area and long 4
inch (102mm) stroke length.
Part Numbers: 331-2793, 331-2794, 331-2856, 331-2857, 331-2858, 331-2988, 331-
3011, 331-3012, 331-3013, 331-3060, 332-2856, 332-3011, 332-3060
Technical Instructions
Installation Instructions
Powers® Controls High Force Pneumatic Damper Actuators
The Powers™ Controls No. 6 Pneumatic Actuator − Tandem Mounting is a rugged,
metal-fabricated device for tandem mounting, the No. 6 Pneumatic Damper Actuator, is
piloted by a positioning relay, mounted on a sturdy angle iron frame. These actuators
operate with up to a 4 inch stroke.
The LC Actuator is a piston type pneumatic actuator. Air pressure is supplied to both
sides of the piston to provide a force balance movement of the shaft. The thermostat
signal is amplified by the action of positioning and reversing relays. These relays give
the necessary volume of air to position the actuator quickly. The LC Actuator is
designed to develop very high thrust with capacity to handle heavy loads. These
actuators operate with a 7 inch stroke.
Part Numbers: 331-2882, 331-3070
Technical Instructions
Installation Instructions